Miter-square.



c. T. MADSEN.

MITER SQUARE. APPLICATION FILED AUG.22, I917.

Patented Feb. 18, 1919.

IN V EN TOR.

WITNESS.- Z/ 11% J .A TTORNE YS.

CHRESTEN TORBEN MADSEN, 0F OAKLAND, CALIFORNIA.

MI'IER-SQUARE.

Specification of Letters Patent.

Patented Feb. 18, 1919.

Application filed August 22, 1917. Serial N 0. 187,667.

To all whom it may concern:

' Be it known that I, CHRnsrnN T. MADSEN, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented new and useful Improvements in Miter-Squares, of which the following is a specification.

This invention relates to miter squares; and has for its object to provide a square of this sort which, through simple and easily operated adjusting means, can be set at a maximum number of angles or positions.

In carrying out this invention a flat miter square, preferably made of sheet steel, is provided with a movable straight edge member centrally positioned on said square and slidably connected thereto. This sliding connection is effected by means of bolts passing through longitudinal slots in the straight edge member and through elliptical slots in the square member.

One form of square embodying the invention is exemplified in the following description and illustrated in the accompanying drawings, in which Figure 1 is a plan view of the square.

Fig. 2 is an elevation of that side of the square which forms the lower edge of Fig. 1.

Fig. 3 is a fragmentary sectional view on line 33 of Fig. 1.

Fig. 1 is a plan view of one of the halves of the straight edge, showing the knurled face which engages the side of the square.

The square shown in the drawings comprises a plane member A, preferably made of sheet steel. This member may have its sides cut to form any desired angle with one another, but the most convenient form is that shown in Fig. 1, in which sides 10 and 11 form an angle of 90, while sides 11 and 12 form an angle of 45.

In the central portion of the member A, there is formed a pair of slots 13 and 14 following arcs of an ellipse having parallel sides and semi-circular ends, said sides being approximately parallel to the side 11. The portion of member A surrounded by the slots 13 and 14: may be cut out, as shown in Fig. 1, to decrease the weight of the square and improve its appearance.

The member A carries a movable straight edge member composed of two halves B and C, each of which consists of a channelshaped piece of material composed of two sides 15 formed integral with and at right angles to a connecting web 16. The members B and C are mounted one on each side of the member A by means of bolts 18 extending through longitudinal slots 17 formed in the webs 16, and through the slots 13 and 1 1 in the member A. Bolts 18 are provided with square heads 19 which, by engaging the sides 15 of member C, as shown in Fig. 2, prevent turning of the bolts when wing nuts 20 are tightened or loosened.

With the mounting thus provided the two halves B and C are movable in unison as a single straight edge member which, by reason of the knurled inner faces of the members B and C (Fig. 4) may be securely clamped in any desired position by screwing up the bolts 18. In view of the longitudinal slots 17 and the slots 13 and 1 1, it will be seen that this straight edge member may not only be readily adjusted in relation to sides 10, 11 and 12 to mark innumerable angles, but may also be similarly adjusted with respect to the sides 10 and 12 to mark parallel lines. A multiplicity of adjustments is thus provided by the use ofa single movable part.

Having thus described my invention, what I claim and desire to secure by Letters Patent is A tool including a triangular member having a pair of elongated transversely spaced parallel slots with curved ends each struck on the same radius and the corresponding ends of the slots extending toward each other, a straight edge member cooperating with the sides of the triangular member and having a pair of slots traversing the respective slots of the triangular member, and means extending through the slots of the members for adjustably securing the same in various positions on said triangular mem her, said slots of the triangular member being arranged parallel to one of the sides of the triangular member.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

OHRESTEN TORBEN MADSEN.

Witnesses:

W. W. HEALEY, M. E. EWING.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. O. 

